Coupling for servicing a pressurized system

ABSTRACT

A service device connects to a service port of a pressurized system. The device includes a valve opening member for opening a valve within the port. The device can attach to a service unit for servicing the pressurized system. The system can be an air conditioning or refrigeration system.

CLAIM OF PRIORITY

This application is a continuation of U.S. application Ser. No.10/326,292, filed Dec. 23, 2002 now U.S. Pat. No. 6,837,064, whichclaims priority to U.S. patent application Ser. No. No. 60/343,181 filedon Dec. 31, 2001, each of which is incorporated by reference in itsentirety.

TECHNICAL FIELD

This invention relates to a coupling for servicing a pressurized system.

BACKGROUND

Servicing couplings are commonly employed to facilitate charging andevacuation of pressurized fluid systems, such as refrigeration systems,air conditioning systems, or hydraulic systems. The service couplingconnects to a service port of the system. The service coupling opens aservice port of a system, allowing fluids, including liquids or gases,to be exchanged with the system. A quick-release interconnection betweenthe service port and the service adapter can facilitate the servicingprocess. For example, when servicing a refrigeration or air conditioningsystem the service coupling can be connected by a flexible hose to arefrigerant supply source, such as a pressurized bottle or cylinder.When the service coupling and service port is opened, refrigerant canflow through the coupling and into the refrigeration system. Becausepressurized fluid systems can be serviced when the system is installedin a confined space such as a vehicle, service couplings having smalldimensions can be useful for convenient servicing.

SUMMARY

In one aspect, a service device includes a body having a first endengagable with a service port, a second end engagable with a serviceunit, and an inner surface defining an interior chamber. The deviceincludes a valve opening member disposed in the interior chamber, and aservice port opening member configured to rotate the valve openingmember relative to the body, the first end and the second end being influid communication when a service port is engaged with the first endand the service port is opened.

The valve opening member can include a plug engaging end proximate tothe first end, the plug engaging end being capable of changing positionrelative to the first end.

The device can also include a spring within the body, biasing the valveopening member toward the first end, and a sealing gasket between thebody and the first end. The first end can be capable of forming a sealwith the port when the first end is engaged with the service port. Theplug engaging end can have a cross section having a substantiallyhexagonal shape. The body can be a portion of a coupling device. Thefirst end can be engagable with a refrigerant port.

The device can include a valve member within the body having a firstposition oriented closer to the first end relative to a second position,the valve member moving from the first position to the second positionwhen the service port is engaged with the first end of the body and theservice port is opened. The first end can be in fluid communication withthe second end when the valve member is in the second position. Thevalve member can be slideably disposed on a surface of the service portopening member.

The device can be a coupling member. An air conditioning orrefrigeration service device can include a service unit including thecoupling member.

In another aspect, a method of opening a service port includes adjustinga position of a valve opening member relative to a first end of aservice port connector, and opening a valve within the service port. Thevalve opening member can include a plug engaging end proximate to thefirst end. The service port connector can be attached to a service unitor can be capable of attaching to a service unit and the first end canbe engagable with the service port. The valve opening member can rotaterelative to the body to open the valve. Adjusting can take place uponattaching the service port connector to the service port. The method canalso include sealing the connector to the port prior to opening thevalve. Opening the valve can actuate a valve member within the connectorto bring a first end of the connector and a second end of the connectorinto fluid communication.

The details of one or more embodiments are set forth in the accompanyingdrawings and the description below. Other features, objects, andadvantages will be apparent from the description and drawings, and fromthe claims.

DESCRIPTION OF DRAWINGS

FIG. 1A is a sectional view of a service coupling.

FIG. 1B is a sectional view of an engagement member of the servicecoupling along the line 1B—1B of FIG. 1A.

FIG. 2 is a sectional view of a service port.

FIG. 3 is a sectional view of the service coupling connecting to aservice port.

FIG. 4 is a sectional view of the service coupling connected to theservice port.

FIG. 5 is a sectional view of the service coupling opening the serviceport.

DETAILED DESCRIPTION

Referring to FIG. 1A, a service coupling 100 includes a mating portion110 for coupling to a service port, a port 120, and a flow path controlportion 130 that allows an operator to control a fluid flow path betweenmating portion 110 and port 120.

Port 120 can be attached to service equipment to connect the equipmentto the service port. For example, the service port can be a service portof an automotive air conditioning system and the service equipment caninclude any sort of maintenance or repair system, such as a diagnostictester, fluorescent leak detection system (i.e., dyes, injection system,lights), electronic leak detection system, recovery and recyclingmachine radiator service device, refrigerant identification tester, aflushing system, an oil insertion system, or a manifold gauge set.

Service coupling 100 is formed by a main body member 140, a flow pathcontrol portion 130, a knob 260, and a port nozzle 125.

Main body member 140 is generally tubular in shape and has an outersurface 148, an inner surface 146, a first end 141, and a second end 149opposite first end 141. End 141 of main body member 140 defines hole 144dimensioned to receive ball bearing 320. Ball bearing 320 is retained inhole 144 by an annular ring 310 which surrounds a portion of outersurface 148. Ball bearing 320 is arranged to engage a service port wheninserted into mating portion 110.

Annular ring 310 includes an inner face 313 with an interior annular lip314 having a raised portion 315. Interior annular lip 314 has a lip wall12. Inner face 313 and outer surface 148 of main body member 140, alongwith lip wall 12 and a lateral wall 143 on outer surface 148 of mainbody member 140, together define an annular volume 340 which houses aspring 330. Spring 330 biases lip wall 12 away from lateral wall 143 sothat annular ring 310 contacts retaining ring 302 and is compressibletoward lateral wall 143 to allow ball bearings 320 to project into notch301 from channels 144 thereby releasing a service port received inmating portion 110.

Inner surface 146 at end 141 of main body member 140 defines a chamber410 for receiving a service port into mating portion 110. Inner surface146 also defines an annular groove 147 around chamber 410 for receivinga sealing member 184 which seals to a service port when received inmating portion 110. In addition to inner surface 146, chamber 410 isbounded by a central body member 220 and a valve member 170.

Central body member 220 is also generally tubular in shape and has anouter surface 228, an inner surface 226, a first end 221, and a secondend 229 opposite first end 221. Central body member 220 defines a volume230 and channels 231, 232 that communicate between outer surface 228 andinner surface 226. Central body member 220 also includes a lateral wall225 that extends inner surface 226 into axial volume 230. Orifice 233located at end 229 extends from volume 230 to outer surface 228.

Axial volume 230 contains an elongate engagement member 150 that extendsinto chamber 410. Engagement member 150 has a first end 151, a secondend 159 opposite first end 151, and a wall 156 including a pair ofopposing lateral slots 154 (only one is shown) and an axial channel 155extending from first end 151 to second end 159. Lateral slots 154 have afirst end 152 and a second end 158. Pin 160 is contained between firstend 152 and second end 158 in slots 154, and traverses laterally throughengagement member 150. Pin 160 is mechanically joined to central bodymember 220. Engagement member 150 is slidable along pin 160, allowingrelative axial movement between member 220 and engagement member 150over the span between first end 152 and second end 158. Pin 160 can alsotransmit torque from handle 260, through member 220 to engagement member150. Spring 190 is contained in axial volume 230 between lateral wall225 of central body member 220 and end 159 of engagement member 150,biasing engagement member 150 toward mating portion 110. Spring 190allows engagement member 150 to be driven into axial volume 230 duringinsertion of a service port into chamber 410 if engagement member 150 isnot aligned properly with the service port, as discussed further belowin regard to FIG. 2.

Annular valve member 170 is also generally tubular in shape and has anouter surface 178, an inner surface 176, a first end 171, and a secondend 179 opposite first end 171. Inner surface 176 defines an annulargroove 17 for receiving a sealing member 250 to seal valve member 170 toouter surface 228 of central member 220. Annular valve member 170defines channels 174 which span between outer surface 178 and innersurface 176. Fixed seal 240 is attached to surface 146 and forms areleasable seal between surface 146 and surface 178. Annular valvemember 170 also includes an outwardly extending lip 177 contacting aspring 180 circumscribing outer surface 178 of annular valve member 170and outer surface 228 of central member 220 but within inner surface 146of main body member 140. Spring 180 biases annular valve member 170 toform the seal between surface 178 and surface 146. Annular valve member170 is slidable along outer surface 228 of central member 220. Whenmember 170 slides away from the mating region 110, for example, whencoupled to a service port as described below, the releasable seal formedbetween fixed seal 240 and inner surface 146 to form a fluid flow pathfrom chamber 410 through channels 174 to channel 126 of port nozzle 125,which, in turn, is in fluid communication with orifice 127 of portnozzle 125.

Flow path control portion 130 includes knob 260, which as describeabove, applies torque to engagement member 150 by rotating inner knob280. Inner knob 280 is fixed to central body member 220. Outer ratchetteeth 264 of knob 260 contact and mate with inner ratchet teeth 224 ofinner knob 280. Gasket 200 is located between knob 260 and knob 280 overorifice 233. Gasket 200 is secured to knob 260 by fastener 210 andfastener 212. Spring 291, which is located between inner knob 260 andholding plate 290, biases knob 260 toward mating portion 110. This biasholds ratchet teeth 264 in contact with ratchet teeth 224. Biasing ofknob 260 toward mating portion 110 by spring 291 also forms a sealbetween gasket 200 and orifice 233.

When knob 260 is rotated in a direction that opens an engaged serviceport (for example, a counter-clockwise direction when knob 260 is viewedfrom above), a surface of ratchet teeth 264 presses against a surface ofratchet teeth 224 in an orientation parallel to the axis of rotation.This configuration allows all torque applied to knob 260 to be appliedto member 150 when opening the service port because no slipping occursbetween knob 260 and inner knob 280. When knob 260 is rotated in adirection that closes an engaged service port (for example, a clockwisedirection when knob 260 is viewed from above), a surface of ratchetteeth 264 presses against a surface of ratchet teeth 224 in anorientation that is not parallel to the axis of rotation. Thisconfiguration allows slippage to occur when the torque applied to knob260 overcomes friction between the surface of ratchet teeth 264 andratchet teeth 224 when closing the service port, thereby avoidingapplication of a potentially damaging force to the service port. Thefriction can be influenced by spring 291. When slippage occurs, knob 260moves away from member 220, allowing the seal between gasket 200 andorifice 233 to break during the slippage.

Referring to FIG. 1B, wall 156 of engagement member 150 forms ahexagonal cross-section circumscribing axial channel 155 for engagingand rotating a service port received in mating portion 110.

Referring to FIG. 2, a service port 500 includes a body 550 and a plug600. Body 550 includes a conduit portion 558 for conducting fluid and amating portion 552 for connecting to service coupling 100. Conduitportion 558 includes a wall 556 defining a fluid channel 560. Matingportion 552 is generally tubular and has an end 559, an outer surface557, and an inner surface 556. Mating portion 552 is joined to conduitportion 558. Outer surface 557 can form a seal with sealing member 184of coupling 100, as discussed further below. Inner surface 556 defines achamber 510 and includes a threaded portion 554. When port 500 isassembled, chamber 510 receives plug 600. Plug 600 is generally tubularin shape and includes a wall 620 with a first end 621, a second end 629,an outer surface 628, and an inner surface 626. End 621 of plug 600 iscapped by a conical tip portion 610. Tip portion 610 includes an outersloped surface 604 extending away from end 621. Outer surface 628 ofwall 620 has a thread 624 are dimensioned to threadedly mate withthreaded portion 554 of inner surface 556 of body 550. End 621 includesorifice 630 penetrating wall plug 600. In a closed position (as shown),tip portion 610 extends into fluid channel 560 and sloped surface 604 oftip portion 610 seals with wall 556 of fluid channel 560 at contactregion 700. Inner surface 626 defines cavity 611, which can be hexagonalin cross-section and dimensioned to snugly receive engagement member 150so that rotation of engagement member 150 can impart a rotational forceto sealing member 600 and move sealing member 600 along threads 555 toopen and close service port 500. In the closed position, radial seal 700prevents fluid communication between fluid channel 560 and chamber 510.In an open position (not shown), contact in region 700 is brokenbringing chamber 510 and channel 560 into fluid communication throughorifice 630.

Referring to FIG. 3, in use, an operator inserts end 559 of service port500 into mating portion 110 and chamber 410 of service coupling 100.Sealing member 184 seals outer surface 557 of service port 500 to innersurface 146 of main body member 140. Ball 320 engages with outer surface557, holding port 500 in coupling 100. Cavity 611 is dimensioned toreceive engagement member 150, each of which can have a hexagonal crosssection. However, at the time of insertion, the cavity 611 of plug 600may not be properly oriented to receive engagement member 150, in whichcase end 151 of engagement member 150 catches on end 629 of plug 600. Asa result, end 629 forces engagement member 150 into volume 230,compressing spring 190. Slots 154 accommodate the inward movement ofengagement member 150 as member 150 slides along pin 160 from first end152 to second end 158. The movement of member 150 allows coupling 100 tomate with port 500 without damaging the coupling or the port.

Referring to FIG. 4, with service port 500 in chamber 410 of servicecoupling 100, the operator manually commences rotating knob 260. Knob260 is mechanically joined to pin 160, which also commences rotationabout axis A. The rotation of pin 160 in turn rotates engagement member150 to align the cross-sectional pattern of member 150 with thecross-sectional pattern of cavity 611. When the cross-sectional patterof member 150 is aligned with the cross-sectional pattern of cavity 611,spring 190 slides member 150 along slot 154 and pin 160 and into cavity611 to engage plug 600, thereby coupling plug 600 and knob 260 forcombined rotation.

Referring to FIG. 5, once member 150 is engaged with plug 600, asdescribed above, rotation of plug 600 using knob 260 moves plug 600along threads 555 of service port body 550, separating sloped surface604 from wall 556 and opening service port 500. As plug 600 is rotated,engagement member 150 extends progressively deeper into cavity 611 andtip 610 progressively withdraws from fluid channel 560 to place fluidchannel 560 in communication with the fluid path formed by channel 155and volume 230. As plug 600 moves along member 150, end 629 of plug 600contacts end 171 of valve member 170 and slides valve member 170 towardknob 260 along central member 220. As member 170 slides toward knob 260,the seal between surface 178 and surface 146 at fixed seal 240 breaks,allowing volume 230 and channel 126 to fluidly communicate via channels231, 232. Valve member 170 detects the presence plug 600 and the openingof the service port and moves toward knob 260 to form an uninterruptedfluid flow path from fluid channel 560, through channel 155 and volume230 to channel 126 in port nozzle 125. With this arrangement, theoperator will not be able to break the seal at a fixed seal 240 untilservice port 500 is received in chamber 410 of service coupling 100 andservice port 500 has been broken when the port is opened. As describedabove, when knob 260 is rotated in a direction that closes an engagedservice port, a surface of ratchet teeth 264 presses against a surfaceof ratchet teeth 224 in an orientation that is not parallel to the axisof rotation, allowing slippage to occur and causing the seal betweengasket 200 and orifice 233 to break during the slippage. The slippageoccurs when plug 600 has been rotated to the closed position. Thebreaking of the seal between gasket 200 and orifice 233 that occurs onceplug 600 has been rotated to the closed position allows pressure withinthe coupling to be equalized with the ambient environment.

A number of embodiments have been described. Nevertheless, it will beunderstood that various modifications may be made without departing fromthe spirit and scope of the invention. Accordingly, other embodimentsare within the scope of the following claims.

1. A service device comprising: a body having a first end engagable witha service port, a second end engagable with a service unit, and an innersurface defining an interior chamber: a valve opening member disposed inthe interior chamber, the valve opening member including a plug engagingend proximate to the first end, the plug engaging end being capable ofchanging position relative to the first end; a service port openingmember configured to rotate the valve opening member relative to thebody, the first end and the second end being in fluid communication whena service port is engaged with the first end and the service port isopened; and a member within the body having a first position orientedcloser to the first end relative to a second position, the member movingfrom the first position to the second position when the service port isengaged with the first end of the body and permitting the service portto be opened.
 2. The service device of claim 1, further comprising aspring within the body biasing the valve opening member toward the firstend.
 3. The service device of claim 1, further comprising a sealinggasket between the body and the first end, the first end being capableof forming a seal with the port when the first end is engaged with theservice port.
 4. The service device of claim 1, wherein the plugengaging end has a cross section having a substantially hexagonal shape.5. The service device of claim 1, wherein the body is a portion of acoupling device.
 6. The service device of claim 1, wherein the first endis engagable with a refrigerant port.
 7. The service device of claim 1,wherein the member is slideably disposed on a surface of the serviceport opening member.
 8. A coupling member comprising: a body having afirst end engagable with a service port, a second end engagable with aservice unit, and an inner surface defining an interior chamber; a valveopening member disposed in the interior chamber; a valve member withinthe body having a first position oriented closer to the first endrelative to a second position; a service port opening member configuredto rotate the valve opening member relative to the body, the valvemember moving from the first position to the second position and thefirst end and second end being in fluid communication when the serviceport is engaged with the first end of the body and the service port isopened; and a sealing gasket between the body and the first end, thefirst end being capable of forming a seal with the port when the firstend is engaged with the service port.
 9. The coupling member of claim 8,wherein the valve opening member including a plug engaging end proximateto the first end, the plug engaging end being capable of changingposition relative to the first end.
 10. The coupling member of claim 9,further comprising a spring within the body biasing the valve openingmember toward the first end.
 11. The coupling member of claim 8, whereinthe plug engaging end has a cross section having a substantiallyhexagonal shape.
 12. The coupling member of claim 8, wherein the firstend is engagable with a refrigerant port.
 13. The coupling member ofclaim 8, wherein the valve member is slideably disposed on a surface ofthe service port opening member.
 14. A method of opening a service portcomprising: adjusting a position of a valve opening member relative to afirst end of a service port connector, the valve opening memberincluding a plug engaging end proximate to the first end, the serviceport connector being attached to a service unit or being capable ofattaching to a service unit and the first end being engagable with theservice port; sealing the connector to the port; and opening a valvewithin the service port after sealing the connector to the port, whereinthe valve opening member rotates relative to a body to open the valve.15. The method of claim 14, wherein adjusting takes place upon attachingthe service port connector to the service port.
 16. The method of claim14, wherein opening the valve actuates a valve member within theconnector to bring a first end of the connector and a second end of theconnector into fluid communication.